<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <script>
    // let a = 10
    // let b = a
    // a = 20
    // console.log(a, b)

    let arr1 = [{name: '张三'}, {name: '李四'}]
    let arr2 = [{name: '张三'}]
    
    // arr1 = arr2

    arr1 = [...arr2]

    arr2.push({name: '王五'})
    console.log('arr1', arr1)
    console.log('arr2', arr2)
  </script>
</body>
</html>